Hova kell beilleszteni a css menü kódokat?

itt egy példa..nah most ezt hova tegyem?: ul#menu{

margin:0;

padding:0;

list-style-type:none;

width:auto;

position:relative;

display:block;

height:40px;

text-transform:uppercase;

font-size:13px;

background:transparent url("images/black.jpg") repeat-x top left;

font-family:Helvetica,Arial,Verdana,sans-serif;

}

ul#menu li{

display:block;

float:left;

margin:0;

pading:0;

border-right:1px solid #ffffff;

}

ul#menu li a{

display:block;

float:left;

color:#ffffff;

text-decoration:none;

padding:12px 20px 0 20px;

height:24px;

height:40px;

}

ul#menu li a:hover{

background:transparent url("images/blue.jpg") repeat-x top left;

}